I can't really help too much, but I had the XTM .18 that comes in the X-cellerator. I had to cut a little off the flywheel nut so it would screw all the way down and tighten the flywheel. It's easy to do.
If I am thinking correctly you may have to cut the end of the crank for the nut to tighten correctly no biggy with a dremel of hacksaw.
I bet if you do a search you will find the answer I belive I read a thread with this very question about 3 weeks ago,